Appendix E Water Resources Technical Report - Los Angeles
Appendix E Water Resources Technical Report
1330 West Pico Blvd Project Water Resources Technical Report July 17, 2018 Prepared by: David J. Curtis, P.E., ENV SP PSOMAS 555 South Flower Street, Suite 4300 Los Angeles, California 90071 (213) 223-1400 (213) 223-1444 Fax Prepared for: Sandstone Properties 1
TABLE OF CONTENTS 1.0 Introduction . 3 1.1 Project Description . 3 1.2 Scope of Work . 3 2.0 Surface Water Hydrology . 3 2.1 General Approach . 3 2.2 Data Sources . 3 2.3 Existing Site Conditions . 4 2.4 Proposed Site Conditions . 4 2.5 Hydrology Results . 4 3.0 Surface Water Quality . 5 3.1 General Approach . 5 3.2 Site Characterization for Water Quality Review . 5 3.3 Pollutants of Concern . 6 3.4 Best Management Practices . 8 4.0 Significant Thresholds . 9 4.1 Surface Water Hydrology. 9 4.2 Surface Water Quality . 9 5.0 Construction Activities . 10 5.1 Construction General Permit . 10 6.0 Level of Significance. 11 6.1 Significance Summary – Surface Water Hydrology . 11 6.1 Significance Summary – Surface Water Quality . 11 7.0 Calculations and Site Plan . 12 2
1.0 Introduction 1.1 Project Description The 1330 West Pico Blvd Project involves the development of a new 38-story mixed-use tower consisting of 696 hotel rooms, 29,600 square feet of conference function space, 14,300 square feet of ballroom, 9 residential units, 62,600 square feet of office, 20,300 square feet of restaurant & bars on a 2.57-acre site that currently includes a 3-story brick building with roof parking. The Project Site is bounded by Pico Blvd on the north, Albany Street to the west, 14th Street to the south, and the 110 Freeway to the east. 1.2 Scope of Work This report provides a description of the surface water hydrology and surface water quality at the Project Site and an analysis of the Project’s potential significance related to the impact on surface water hydrology and surface water quality. 2.0 Surface Water Hydrology 2.1 General Approach The watershed of the project was identified and characterized for the proposed condition. Computer modeling was used to estimate the runoff flow rate for the 85th % storm (SUSMP/LID), 5-,10-, 25-, 50-, and 100-year storm events. 2.2 Data Sources The primary sources of data are the LACDPW Hydrology / Sedimentation Manual and Appendices (LACDPW 2006), and the Los Angeles County Standard Urban Stormwater Mitigation Plan (September 2002). Rainfall and soil characteristics for the Project Site are given in Isohyetal Map Figure LACDPW 1-HI.18 (Section 4). A copy of the map is provided in Section 6.0. The 50-year (24-hour) rainfall isohyet nearest the project area is approximately 5.70-inches. The isohyets for all of the storm events, based on factors from the LA County Hydrology Manual in Table 5.3.1, are as listed: 5-Year 24-Hour: 10-Year 24-Hour: 25-Year 24-Hour: 50-Year 24-Hour: 100-Year 24-Hour: 3.33-inches 4.07-inches 5.00-inches 5.70-inches 6.40-inches As shown on the Isohyetal Map, the soil classification of the project site falls predominantly into Soil Type 012. The project area to be disturbed is approximately 2.57 acres. 2.3 Existing Site Conditions The existing Project Site is comprised of a 3-story commerical building with parking on the roof totaling approximately 2.57 acres with an average imperviousness of 90%. The Project Site is bounded by Pico Blvd on the north, Albany Street to the west, 14th Street to the south, and the 110 Freeway to the east. The existing site drainage flows west to Albany Street via sheet flow to the curb and gutter system. The runoff enters the City storm drain system at a catch basin at the corner of Albany and 14th Streets located at either the southeast corner of Albany and 14th Streets. 3
2.4 Proposed Project Site Conditions The proposed project will consist of a 38-story tower that has one main podium amenities level on the 5th floor above the street. The assumed average imperviousness of the proposed Project Site will be approximately 90% once all landscaping and hotel pool amenities are installed. The proposed stormwater flows will continue to drain to Albany Street as to not change the existing drainage pattern. Reductions in the proposed flow from Low Impact Development (LID) requirements will accommodate for the diverted stormwater from the County drain to the City drain system. 2.5 Hydrology Results Table below summarizes the hydrology results: Table 1. Existing and Proposed Peak Runoff Flows Existing Proposed* Storm Event QTotal [cfs] QTotal [cfs] % Reduction -17% 5-Yr 3.68 3.06 -10% 10-Yr 4.81 4.31 -4% 25-Yr 6.38 6.10 -3% 50-Yr 7.27 7.07 -10% 100-Yr 8.90 8.04 * Includes reduction from LID implementation (subtracting the 85th Percentile storm flow of 0.86 cfs) Expected peak runoff flows for the 5-, 10-, 25-, 50- and 100-year storm events for the Project are shown in Table 1. This table contains a comparison of the existing and proposed peak runoff flows at the property line of the Project Site. The site was reviewed as one hydrology area since the runoff all flows south to the same confluence point at Albany and 14th Streets. This review demonstrates that the Project will not exceed the existing stormwater flows when compared to a common tributary point at the corner of Albany and 14th Streets. It takes into account the Project’s required Low Impact Development (LID) reductions which are needed to manage post construction stormwater runoff. The Project will include the installation of private catch basins, planter drains, and roof downspouts throughout the Project Site to collect roof and site runoff, and direct stormwater to the LID system through a series of underground storm drain pipes. This onsite stormwater conveyance system would serve to prevent onsite flooding and nuisance water build-up on the Project Site. With implementation of a stormwater capture and use system (i.e. harvesting system for onsite irrigation use), the volume of water leaving the Project Site will be reduced from the existing flows. The Project Site is not located within a FEMA or City of Los Angeles designation 100- or 500- year flood plain, nor is it located within a potential inundation area as designed by the City of Los Angeles General Plan Safety Element. 4
3.0 Surface Water Quality 3.1 General Approach The project falls under the jurisdiction of the City of Los Angeles Department of Public Works, which follows the 2009 Low Impact Development (LID) Manual design guidelines. The purpose of this surface water quality report is: To meet City of Los Angeles Department of Public Works requirements; To document that the Los Angeles County LID requirements will be met; To determine the proposed development’s impact on existing hydrologic conditions; To identify the pollutants of concern and provide BMPs that will mitigate those pollutants of concern; and To provide sufficient detailed information to support detailed hydraulic design of stormwater treatment systems. 3.2 Site Characterization for Water Quality Review Current Property Use: At grade parking lot and open space, and parking structure (in the southern portion of the site), which will remain. The parking lot is currently being used as a temporary construction staging area for the Los Angeles County Metropolitan Transportation Authority’s Regional Connector project. Proposed Property Use: Mixed-use: hotel, conference center, residential, office and commercial development. Soils: The soil of the watershed is classified as Type 012, as shown in the Hydrology Map from the Los Angeles County Department of Public Works (LACDPW) website (see section 6.0 for map). Receiving Waters: The Project Site is tributary to the Ballona Creek. The Ballona Creek is listed on the 2012 CWA Section 303(d) list (approved by SWRCB June 30, 2015) as impaired due to the prevalence of the pollutants shown in Table 2, which is excerpted from the State Water Resources Control Board, “Quality Limited Segments” article dated June 9, 2016. Currently, this waterway’s existing beneficial uses include ground water recharge, warm freshwater habitat, water contact recreation, and non-contact water recreation; potential uses include municipal and domestic supply, industrial service supply, and wildlife habitat. 5
Table 2: Receiving Waters for Urban Runoff from Site1 Receiving Waters 303(d) List Impairments2 Designated Beneficial Uses Proximity to RARE Uses Existing/Intermittent: WILD No Ballona Creek Cadmium (sediment), Coliform (bacteria), Copper, Cyanide, Lead, Selenium, Toxicity, Trash, Viruses, Zinc 3.3 Potential: MUN, WARM Pollutants of Concern Table 3 lists the pollutants anticipated to be generated by the Project’s proposed land uses. Because the Project falls under the category of commercial development, the following pollutants could potentially be generated: sediment/turbidity, nutrients, trash and debris, oxygen demanding substances, bacteria and viruses, oil and grease and pesticides. Type of Development (Land Use) Commercial Development Residential Sediment /Turbidity Table 3: Potential Pollutants Generated by Land Use Type3 Organic Trash Oxygen Bacteri Nutrient Oil & Compound & Demanding a & s Grease s Debris Substances Viruses Pesticide s Metals P(1) P(1) P(4) P P(4) P(3) P P(1) N P P N P P(1) P P(2) P N Abbreviations: P Potential N Not expected Notes: (1) (2) (3) (4) A potential pollutant if landscaping or open area exists on the Project site A potential pollutant if land use involves animal waste Specifically, petroleum hydrocarbons Bacterial indicators are routinely detected in pavement runoff. A comparison of the pollutants existing in the Ballona Creek based on the State 303(d) list and pollutants associated with the planned land use activities on the Project Site show an overlap of sediment, trash, and bacteria & viruses as pollutants. These common pollutants are considered the pollutants of concern. Stormwater best management practices (BMP) proposed for the Project will be designed to address these pollutants of concern. Table 4 summarizes the efficiency of general categories of BMPs in treating different types of pollutants. The City of Los Angeles requires LID compliance for this Project. As noted above, the LID concept for this project is a stormwater capture and use system. The runoff within the cistern will be pumped up for irrigation of the landscape around the Project Site. High flow outlets for the rainwater harvesting cistern will be routed to discharge as per proposed conditions, as described in section 2.4. 1 State Water Resources Control Board, Los Angeles Region. Water Quality Control Plan Los Angeles Region. June 13, 1994. 2 Los Angeles Regional Water Quality Control Board. 2010 CWA Section 303(d) List of Water Quality Limited Segments. October 11, 2011. 3 Riverside County Flood Control and Conservation District, Riverside County Water Quality Management Plan for Urban Runoff, July 24, 2006. Note: This source is utilized because the Los Angeles County Flood Control District has not established a table that outlines pollutants of concern. 6
Ballona Creek Pollutant of Concern (Yes/No) Sediment/Turbidity Table 4: Treatment Control BMP Selection Matrix4 Treatment Control BMP Categories Planter Veg. Box / Swale Wet Sand Water Detention Harvesting /Veg. Ponds or Filter or Quality Basins /Infiltration Wetlands Filtration Inlets Filter Basins & Strips Trenches H/M Yes Nutrients L No Organic Compounds U No Trash & Debris L Yes Oxygen Demanding L Substances No Bacteria & Viruses U Yes Oils & Grease H/M No Pesticides (non-soil U bound) No Metals H/M No Abbreviations: L: Low removal efficiency 4 Hydrodynamic Separator Systems Manufactured / Proprietary Devices M H/M H/M H/M L H/M (L for turbidity) U M H/M H/M L/M L L U U U U H/M L L U M U U H/M M H/M U M H/M H/M H/M L L U U H/M U H/M L L U M U U H/M M L/M U U U U U L L U M H H H L L U H/M: High or medium removal efficiency U: Unknown removal efficiency Riverside County Flood Control and Conservation District, Riverside County Water Quality Management Plan for Urban Runoff, July 24, 2006. Note: This table is utilized because the Los Angeles County Flood Control District has not established a table that summarizes each BMP’s efficiency for treating pollutants of concern. 7
3.4 Best Management Practices Source and Treatment Control Best Management Practices (BMPs) are required for this Project under the LA County Standard Urban Stormwater Mitigation Plan (SUSMP) and City of Los Angeles Low Impact Development (LID) Standards Manual. 3.4.1 Site Design BMPs 3.4.1.1 Minimize Stormwater Pollutants of Concern The Project will minimize pollutants of concern by maximizing the reduction of pollutant loadings to the Maximum Extent Practicable. The pollutants of concern – namely, sediment, trash, and bacteria & viruses– will be addressed through a pre-treatment settlement device connected to the cistern within the Project Site. Building roof run-off, which comprises of the majority of the site, will be collected via roof drains and routed internally through the building and plumbed into the harvesting tank. Prior to connection to the harvesting tank, downspout filters will be installed to remove any debris that enters the on-site piping system. In addition, permeable pavement is proposed on-site to reduce the overall stormwater runoff. All other stormwater run-off will be collected via private on-site catch basins or trench drains fitted with an insert to collect debris and sediment and routed to the stormwater tank. 3.4.1.2 Conserve Natural Areas The existing Project Site consist of a 3-story commercial building. There is minimal existing landscape within the site. The existing structure will be demolished. The proposed development within the site includes additional landscape as well as a landscaped amenities floor. The proposed development will modify the whole site and will provide water quality treatment to meet the LID requirements of the City of Los Angeles. 3.4.2 Source Control BMPs 3.4.2.1 Protect Slopes and Channels There are no unprotected slopes or unlined channels onsite. The entire area to be developed will be either vegetated or hardscaped. 3.4.2.2 Provide Storm Drain System Stenciling and Signage Stenciling will be provided for public storm drains near the vicinity of the project. 3.4.2 Treatment Control BMPs 3.4.3.1 Mitigation Design (Volumetric or Flow based) Volume-based or flow-based design standards may be used separately or in combination. Volume-based criteria are used in the sizing of the cistern. The LID requirements, approved by the Regional Water Quality Control Board, call for the treatment of the peak mitigation flow rate or volume of runoff produced either by a 0.75” 24-hr or the 85th percentile rainfall event, whichever is greater. The rainfall intensity of the 85th percentile rainfall is 1.1 inch, therefore the 85th percentile rainfall event governs. 8
The LID calculation methodology was used to calculate the required treatment volumes for each of the discharge points from the site. LID Calculations are provided in section 6.0. The results are summarized in the tables below. Table 5. Proposed Condition SUSMP Results 85th percentile Project Site BMP Type Area [ac] *VM [ft3] Stormwater Capture 2.57 8,415 and Use *The total volume (Vm) of stormwater runoff to be mitigated was calculated by analyzing the project area as one area. Using this Vm and the appropriate BMP calculation from the City of LA LID manual, Table 6 shows the requirements for the area. Table 6. Summary SUSMP / LID Mitigation BMPs Area 15 Area [ac] 2.57 Impervious Area [ac] 2.31 Required Storage Tank VM [ft3] BMP Type 8,415 Storage Tank Treated Impervious Area Untreated [ac] 100 0 Provided Treatment VM [ft3] % 8,415 Total Percent Treatment 100% The proposed BMP in place is able to provide the full 85th percentile storm treatment. The selected BMP for the site has the capacity to capture and reuse more than the required baseline volume of 8,415 ft3. The total provided treatment volume is 8,415 ft3 or 63,000 gallons. 4.0 Significance Thresholds 4.1 Surface Water Hydrology The City of Los Angeles CEQA Thresholds Guide states that a project would normally have a significant impact on surface water hydrology if it would: 4.2 Cause flooding during the projected 50-year developed storm event, which would have the potential to harm people or damage property or sensitive biological resources; Substantially reduce or increase the amount of surface water in a water body; or Result in permanent, adverse change to the movement of surface water sufficient to produce a substantial change in the current or direction of water flow. Surface Water Quality The City of Los Angeles CEQA Thresholds Guide states that a project would normally have a significant impact on surface water quality if discharges associated with the project would create pollution, contamination or nuisance, as defined in Section 13050 of the California Water Code (CWC) or that 5 BMP required calculation based on City of LA LID manual. 9
cause regulatory standards to be violated, as defined in the applicable NPDES stormwater permit or Water Quality Control Plan for the receiving water body. The CEQA Thresholds Guide and CWC include the following definitions: “Pollution” means an alteration of the quality of waters of the state to a degree which unreasonably affects either the following: 1) the waters for beneficial uses or 2) facilities which serve these beneficial uses. “Pollution” may include “Contamination”. “Contamination” means an impairment of the quality of the waters of the state by waste to a degree, which creates a hazard to the public health through poisoning or through the spread of disease. “Contamination” includes any equivalent effect resulting from the disposal of waste, whether or not waters of the state are affected. “Nuisance” means anything which meets all of the following requirements: 1) is injurious to health, or is indecent or offensive to the senses, or an obstruction to the free use of property, so as to interfere with the comfortable enjoyment of life or property; 2) affects at the same time an entire community or neighborhood, or any considerable number of persons, although the extend of the annoyance or damage inflicted upon individuals may be unequal; and 3) occurs during, or as a result of the treatment or disposal of wastes. 6 5.0 Construction Activities 5.1 Construction General Permit In 2003, the California State Water Resources Control board (SWRCB) adopted the General Construction Activity Stormwater Permit (CGP)7, which is “ required for all storm water discharges associated with construction activity where clearing, grading, and excavation results in a land disturbance of one or more acres.” Under the CGP, the following Permit Registration Documents must be submitted to SWRCB through the SMARTS website: a Notice of Intent (NOI), a Storm Water Pollution Prevention Plan (SWPPP), and other compliance related documents required by this CGP and mail the appropriate permit fee to the SWRCB. Because the land disturbance for the Project Site is over one acre, the requirements mentioned above will need to be implemented. The CGP requires all SWPPPs be written, amended, and certified by a Qualified SWPPP Developer, emphasizing BMPs, which are defined as “schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the United States.” The SWPPP has two major objectives: to help identify the sources of sediment and other pollutants that affect the quality of stormwater discharges; and to describe and ensure the implementation of BMPs to reduce or eliminate sediment and other pollutants in storm water and non-storm water discharges. The SWPPP must include BMPs that address source control, BMPs that address pollutant control, and BMPs that address treatment control. Furthermore, the CGP requires that a project are enrolled for more than one continuous three-month period to submit information and annually certify that their site is in compliance with these requirements. The primary purpose of this requirement is to provide information needed for overall program evaluation and pubic information. The CGP requires that key personnel (e.g., Qualified SWPPP Developers, inspectors, etc.) have specific training or certifications to ensure their level of knowledge and skills are 6 7 City of Los Angeles. LA CEQA Thresholds Guides. 2006 Construction General Permit Water Quality Order 2009-0009-DWQ, Fact Sheet, website: http://www.waterboards.ca.gov/water issues/programs/stormwater/docs/constpermits/wqo 2009 000 9 complete.pdf, accessed October 25, 2016. 10
adequate to ensure their ability to design and evaluate project specifications that will comply with CGP requirements. Erosion control and drainage devices are required to be provided in accordance with the CGP and SWPPP as well as the MS4 Permit. Dewatering activities during construction will need to be implemented through BMPs targeting sediment specific pollutants such as Sediment Treatment, Sediment Basin, Sediment Trap, and other BMPs listed on CASQA’s NS-2 Dewatering Operations8. 6.0 Level of Significance 6.1 Significance Summary – Surface Water Hydrology Based on the above, the Project would not result in an incremental impact for flooding on either on-site or off-site areas during a 50-year storm event, it would not substantially increase the amount of surface water in a water body, and it will not result in a permanent adverse change to the movement of surface water that would result in an incremental effect on the capacity of the existing storm drain system. Therefore, the development of the Project would result in less than significant impact on surface water hydrology. 6.2 Significance Summary – Surface Water Quality Due to the nature of the proposed development to change the land use from an existing parking lot to a mixed-use residential and commercial development, the Project will result in a reduction of potential types of pollutants. As detailed in Section 3.0, a comparison between the potential pollutant based on land use and the 303(d) list for Ballona Creek indicates that the pollutants of concern are sediment, trash, and bacteria & viruses. These three pollutants of concern will be addressed through the proposed stormwater BMPs in order to comply with Los Angeles County’s Standard Urban Stormwater Mitigation Plan (SUSMP) and City of Los Angeles’ Low Impact Development Ordinance. These BMPs include elements such as permeable pavement, rainwater harvesting, and an increase of landscape area. During construction of the project, a SWPPP written by a Qualified SWPPP Developer will be prepared to implement temporary control measures throughout the construction phase. Based on the analysis contained in this report, there are no significant impacts for surface water quality as a result of the Project. With compliance under the SWPPP, SUSMP, and the City’s LID Ordinance, construction and operational water quality impacts would be less than significant. 8 California Stormwater BMP Handbook Construction, Fact Sheet NS-2 Dewatering Operations, July 2012. 11
7.0 Calculations and Site Plan 12
ALBANY STREET PARKING ACCESS BICYCLE PARKING PROPERTY LINE SHORT TERM BICYCLE PARKING 44 SPACES 6'-10" 3'-0" DROP OFF 3-FOOT DEDICATION LINE 9'-10" 24'-0" 13-FOOT EASEMENT SHORT TERM BICYCLE PARKING 44 SPACES LINE OF OPENING ABOVE T LINE OF CANOPY ABOVE BACKUP GENERATOR MECHANICAL PARKING 30'-3" SHORT TERM BICYCLE PARKING 44 SPACES (COVERED) ELEC ELEC SERV PROVIDER VAULT MAIN ELEC ROOM RESTAURANT HOTEL ENTRY DROP OFF ELEC RESIDENTIAL ENTRY TELECOM ENTRY HOTEL BOH / KITCHEN / RECEIVING MDF D 52'-10" MECH R 101'-8" 12'-0" 19'-11" A 46'-2" OFFICE LOBBY 15'-6" TELECOM HOTEL ENTRY F OFFICE ENTRY WEST PICO BOULEVARD SHORT TERM BICYCLE PARKING 44 SPACES (COVERED) HOTEL LOBBY 16'-1" 73'-10" HOUSE TELECOM WEST 14TH STREET FIRST EVANGHELICAL FREE CHURCH LOBBY BAR/LOUNGE 536'-9" RESIDENTIAL LOBBY ELEC BACKUP POWER DIST LOADING ACCESS SIDEWALK EASEMENT PARKING ACCESS PROPERTY LINE LINE OF BUILDING ABOVE PARKING STAGING L EGEN D 20 SPACES Hotel Support Mechanical Amenities Hotel Circulation Office Building Support Hotel Function Space Parking Circulation Hotel Prefunction Residential Retail / F&B Hotel Guestrooms BUILDING PL AN 13 3 0 W E S T P I C O B O U L E VA R D , L O S A N G E L E S , 9 0 0 15 Prepared for Sandstone Properties N PODIUM LEVEL 1 1” 20’ 5’ 20’ 40’ Graphic Scale: 1 inch 32 feet 80’ June 6th, 2018 Page 13 hok.com
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7- 016 015 0 09 009- 002 004 3- 002 -004 004 -00 9 002 01 DPA - 4 9 00 BEVERLY HILLS 1-H1.17 013 12- -0 002 002 012 006 -00 009 5.8 017 017 013 PROJECT SITE 013 5.6 LOS ANGELES 1-H1.19 013 2 009 009 - 007 2 0 -0 00 9 ----0 13 006 013 013 013 DPA - 7 006 6.2 2 01 006 3 008 7- 020 00 1 -0 - 3 01 6.0 069 6- 13 130020- 6.2 -0 6.4 040 002 01 3- 01 DPA - 4 00 6.6 -118º 22' 30'' 02 -0 066 002-- B U R B A N K 1-H1.28 34º 07' 30'' 7 01 DPA - 7 013 017 003 006 013 006 016 5.4 013 016 N W E S DPA - 6 7.2 DPA - 6 SOIL CLASSIFICATION AREA INCHES OF RAINFALL DEBRIS POTENTIAL AREA 020 1 -118º 15' 00'' 017 -003 003 016 -016 I N G L E W O O D 0 1-H1.8 1 34º 00' 00'' 2 Miles 25-YEAR 24-HOUR ISOHYET REDUCTION FACTOR: 0.878 10-YEAR 24-HOUR ISOHYET REDUCTION FACTOR: 0.714 HOLLYWOOD 50-YEAR 24-HOUR ISOHYET 1-H1.18
PROJECT SITE
Project No, 1SAN390201 1330 Pico Blvd Los Angeles, CA Volume Calculations: Whole Area Givens: Inputs Areas Breakdown Area Total Impervious, Ai Pervious, Ap Undeveloped Area, Au Exempt Area sqft 111,949 100,754 11,195 0 0 acre 2.57 2.313 0.257 0 0 TOTAL 111,949 2.57 11,195 11,195 0.257 0.257 Site Features Landscaped Area 5th Level TOTAL Pervious % 100% 90% 10% 0% 0% 100% Landscaped Areas Counted Towards ETWU** Additional Landscaped Area Soil media infiltration rate: TFill Drawdown time, T (hr) KSat,Design Factor of Safety, FS Vdesign Planter Factor of Safety Design Storm Design Storm Intensity Planting Factor 7 Month Evapotranspiration, ET 7 0 0 5 3 48 2 1.5 85th Percentile 1.1 0.45 21.7 in/hr hrs hrs (Table 4.5) (Table 4.5) (Table 4.5) (Per City of LA requirement) (Per LA County Hydrology GIS) (Weighted Average. Per Landscape Architect) (Per City of LA Irrigation Guidelines, App C) in i. Determine the Mitigation Volume (VM): VM (ft3) 85th Percentile Intensity (in) * Catchment Area (acres) * (3630 cuft/1ac-in) where Catchment Area (acres) (Impervious Area * 0.9) [(Pervious area Undeveloped area) * 0.1] 1.1*[(2.313*0.9) [(0.257 0)*0.1]] * 3630 VM (ft3) ft3 8415 or 62,949 Gallons (If Design is Capture and Use i.e. Rainwater Harvesting) VM (ft3) ft3 The design will be a rainwater harvesting system, therefore, VM (ft3) ft3 8415 or 62,949 Gallons ii. Determine planting area (ft2): Planting Area (ft2) 11,195 ft2 iii.Determine Planter Factor, PF, (ft2) Planter Factor (ft2) Planting Factor x Planting Area Planter Factor (ft2) Planter Factor (ft2) 0.45 x ( 11194.9 0) ft2 5037.705 (Per landscape architect, use planting factor adjusted for loss of irrigation efficiency) ft2 iv.Determine the 7-month (Oct 1-April 30) Estimated Total Water Use (ETWU): ETWU (7-month) ETWU (7-month) ETWU (7-month) ET7 x 0.62 x PF 21.7 x 0.62 x 5037.705 67777 gal or 9,061 ft3 v. Verify ETWU(7-month) is greater than or equal to VWQDV: ETWU (7-month) 67,777 V (Design) (gal) 62,949 CAPTURE AND USE IS FEASIBLE 03/19/2018
Peak Flow Hydrologic Analysis File location: W:/1SAN390201/ENGR/DOCS/EIR Hydrology Report/Attachments/Hydro Calc/Pico - Existing 5 Yr.pdf Version: HydroCalc 0.3.0-beta Input Parameters Project Name Subarea ID Area (ac) Flow Path Length (ft) Flow Path Slope (vft/hft) 50-yr Rainfall Depth (in) Percent Impervious Soil Type Design Storm Frequency Fire Factor LID Project EX - Subarea 1A 2.57 350.0 0.01 5.7 0.9 12 5-yr 0 False Output Results Modeled (5-yr) Rainfall Depth (in) Peak Intensity (in/hr) Undeveloped Runoff
the LA County Hydrology Manual in Table 5.3.1, are as listed: 5-Year 24-Hour: 3.33-inches 10-Year 24-Hour: 4.07-inches . Soils: The soil of the watershed is classified as Type 012, as shown in the Hydrology Map from the Los Angeles County Department of Public Works (LACDPW) website (see section 6.0 for map). .
Issue of orders 69 : Publication of misleading information 69 : Attending Committees, etc. 69 : Responsibility 69-71 : APPENDICES : Appendix I : 72-74 Appendix II : 75 Appendix III : 76 Appendix IV-A : 77-78 Appendix IV-B : 79 Appendix VI : 79-80 Appendix VII : 80 Appendix VIII-A : 80-81 Appendix VIII-B : 81-82 Appendix IX : 82-83 Appendix X .
Appendix G Children's Response Log 45 Appendix H Teacher's Journal 46 Appendix I Thought Tree 47 Appendix J Venn Diagram 48 Appendix K Mind Map 49. Appendix L WEB. 50. Appendix M Time Line. 51. Appendix N KWL. 52. Appendix 0 Life Cycle. 53. Appendix P Parent Social Studies Survey (Form B) 54
Appendix A. Piping Color Code Appendix B. Filtration Galleries Appendix C. Steel Pipe Appendix D. Gravel Support for Slow Sand Filters Appendix E. Gravel Support for Rapid Rate Sand Filter Appendix F. Quantity of Water Plant Residuals Generated Appendix G. Minor Water Systems [REVOKED] 2 SUBCHAPTER 1. INTRODUCTION Section .
Appendix H Forklift Operator Daily Checklist Appendix I Office Safety Inspection Appendix J Refusal of Workers Compensation Appendix K Warehouse/Yard Inspection Checklist Appendix L Incident Investigation Report Appendix M Incident Investigation Tips Appendix N Employee Disciplinary Warning Notice Appendix O Hazardous Substance List
Water Re-use. PRESENTATION TITLE / SUBTITLE / DATE 3. Water Scarcity. Lack of access to clean drinking water. New challenges call for new solutions Water Mapping: Reduce, Reuse, Recycle, Reclaim Water resources Water Fit for Purpose Water resources Tap Water Waste water Cow Water Rain water Others WIIX Mapping True Cost of Water
Appendix D, Prescribed Form for Bidder's Profile 35 12. Appendix E, Letter of Authorized Person in Charge 36 13. Appendix F, Undertaking 37 14. Appendix G, Form of Technical Proposal 38 15. Appendix H, Form of Financial Proposal 39 16. Appendix I, Form of Performance Security 40 17. Appendix J, Bank Guarantee for Advance Payment 41
Appendix C3-6: IEH Analytical Lab QA Manual Appendix D: QVIR Water Quality Checklists and Worksheets Appendix D1: Field Activities Review Checklist Appendix D2: Laboratory Data Review Checklist Appendix D3: Field Water Quality Data Sheets Appendix E: Field Equipment Manuals and Instr
The Need for Adult High School Programs 1 G.E.D.: The High School Equivalency Alternative 9 An Emerging Alternative: The Adult High School Ciploma 12 Conclusion 23 Appendix A -- Virginia 25 Appendix B -- North Carolina 35 Appendix C -- Texas 42 Appendix 0 -- Kansas 45 Appendix E -- Wyoming 48 Appendix F -- Idaho 56 Appendix G -- New Hampshire .
